HTPB Propellant Aging

Christiansen, A.; Layton, Lionel H.; Carpenter, Ronn L.

doi:10.2514/3.57807

Cited by 43 publications

(15 citation statements)

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“…A severe embrittlement was observed for F1-samples aged at 70 °C for times longer than 2 weeks, whereas F2-samples showed a greater resistance by withstanding a period of 8 weeks before embrittlement was observed. Table 2 presents the aging constant rate (k) obtained from the linear regression of elastic modulus and ln(t/t 0 ), as empirically proposed by Christiansen et al 9 . At temperatures from 50 to 65 °C, aging rates resulted higher for stoichiometric HTPB/IPDI-formulation, as indicated by the ratio k F1 /k F2 (Table 2), meanwhile similar rates was observed at 70 °C.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Thermal aging of HTPB/IPDI-based polyurethane as a function of NCO/OH ratio

et al. 2011

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Thermal aging of hydroxy-terminated polybutadiene/isophorone diisocyanate (HTPB/IPDI)-based polyurethane was studied as a function of NCO/OH ratio (1.0 and 0.85). Samples were aged in air ovens at 50, 60, 65, and 70 °C for periods of time from 1 to 34 weeks. Changes in chemical (swelling testing and FT-IR spectroscopy) and mechanical (tension testing and hardness) properties were evaluated throughout the aging assays. Correlation between equilibrium swelling ratio and elastic modulus, coupled with changes in FT-IR spectra, indicated oxidative cross-linking as the dominant mechanism for both molar ratios investigated. However, determination of Arrhenius activation energy resulted in values of (82 ± 10) kJ.mol -1 and (156 ± 30) kJ.mol -1 for 1.0 and 0.85 NCO/OH ratios, respectively, thus revealing faster oxidative degradation kinetics for higher urethane linkage networks.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Thermal aging of HTPB/IPDI-based polyurethane as a function of NCO/OH ratio

et al. 2011

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“…The mechanical properties of composite energetic materials, such as explosives and solid rocket motor propellants, change with time, ap rocess known as aging [1][2][3][4][5][6][7][8][9][10][11][12][13][14].A ging is usually the result of chemical (e.g. cross-linking) and physical (e.g.…”

Section: Iintroductionmentioning

confidence: 99%

Active Sensing for Monitoring the Properties of Solid Rocket Motor Propellant Grains

Lopatin¹,

Grinstein²

2015

Propellants Explo Pyrotec

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Aging induced changes in the mechanical properties of solid propellant can lead to defects, such as cracks and grain‐liner separations, that limit the service lifetime of solid rocket motors. The use of embedded sensors is one approach that is being explored by various researchers to augment legacy inspection and prediction methods. We present herein an active sensing technique that is particularly suited for monitoring the properties of solid propellant, as it does not introduce electrical wires into the motor. Based on the use of magnetic induction for excitation and an optical fiber Bragg grating sensor to measure deformation, the method can be used to characterize the properties of a material with which it is in contact. In this paper, we first present proof‐of‐principal experiments demonstrating the utility of the method in characterizing the visco‐elastic properties of an adhesive, and in following changes in viscosity of an epoxy resin during cure. We next apply the method to solid propellant, and present data demonstrating that the method can be used to measure a deflection‐load curve of an aluminized HTPB propellant. In addition, we also show that the observed strain rate sensitivity matches that found in the literature and that the method had more than adequate resolution to observe the expected changes in material properties due to aging.

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“…During the last two decades, more and more attention has been paid to the design, manufacturing, and evaluation of solid propellant grains in order to meet service life and performance requirements [1]. Meanwhile, it is also recognized that aging studies (for example: mechanical aging [2,3] and chemical aging [4,5]) are necessary to predict the service life of solid propellant grains, and the thermal response under thermal shock loads [6] plays an important role. Therefore, the reduction of thermal response is one of the significant considerations in the primary design of solid propellant grains and some effective designs (for example: free flap design, P-groove design, stress reliever design) have been adopted [7].…”

Section: Introductionmentioning

confidence: 99%

Studies of poisson's ratio variation for solid propellant grains under ignition pressure loading

Chyuan

2003

International Journal of Pressure Vessels and Piping

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HTPB Propellant Aging

Cited by 43 publications

References 1 publication

Thermal aging of HTPB/IPDI-based polyurethane as a function of NCO/OH ratio

Thermal aging of HTPB/IPDI-based polyurethane as a function of NCO/OH ratio

Active Sensing for Monitoring the Properties of Solid Rocket Motor Propellant Grains

Studies of poisson's ratio variation for solid propellant grains under ignition pressure loading

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